/Engine/Source/Editor/UMGEditor/Public/UMGEditorModule.h
Get current toolbar extenders for widget editor
[TArrayView](API\Runtime\Core\Containers\TArrayView)< [FWidgetEditorToolbarExtender](API\Editor\UMGEditor\IUMGEditorModule\FWidgetEditorToolbarExtender) > GetAllWidgetEditorToolbarExtenders()